class Container {
    static of(value) {
        return new Container(value);
    }
    constructor(value) {
        this._value = value;
    }
    map(fn) {
        return continer.of(fn(this._value));
    }
}

class Maybe {
    static of(x) {
        return new Maybe(x);
    }
    isNothing() {
        return this._value === null || this._value === undefined;
    }
}
